Casting bolt-holes in chilled mold-boards



(No Model.)

' B. B., HARRIS.

. Casting Bolt Holes in Chilled Mold Boards.

No. 237,182. Patented Feb. 1,1881.

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WITNESSEST INVENTOR:

ATTORNEYS.

N. PETERS, PHOTO-LITHDGRAPHER WASHINGTON, D, c.

UNITED STATES PATENT. OFFICE.

BURNETT B. HARRIS, OF SOUTH BEND, INDIANA.

CASTING BOLT-HOLES IN CHILLED MOLD-BOARDS.

SPECIFICATION forming part of Letters Patent No. 237,182, dated February 1, 1881.

Application filed June 30, 1880. (No model.)

To all whom it may concern Be it known that I, BURNETT B. HARRIS,

of South Bend, in the county of St. Joseph holes in chilled mold-boards with metal dies in such a manner that the contraction of the casting in cooling will not break off the points from the metal dies or crack the mold-boards.

A represents the upper part of a flask, and B the lower part or drag. G is the chill, which is constructed and secured to the drag B in the manner described in Letters Patent No. 228,064, granted to me May 25, 1880.

In the chill U,in the place where a die is to be placed, I drill a hole, D, three-eighths of an inch (more or less) in diameter and depth, and fill the said hole with green sand.

The die E is cast with a sharp point, F, upon its large end, about three-sixteenths of an inch in diameter at its base and three-sixteenths of an inch long. In the mold-board pattern G are formed countersunk or tapering holes considerably larger than the required bolt-holes, and into the said holes are fitted similarlyshaped cups H, which have holes formed through them tapered or flared in the opposite direction and of the size of the required bolt-holes. The dies E are placed in the cups H, and the cups and dies are placed in the holes in the pattern G, the points F of the dies being pressed down into the green sand in the holes D. After the mold has been formed the cups H are removed and the pattern G is drawn, leaving the dies E in place upon the chill, the resistance of the sand to the points F being sufficient to prevent the dies E from slipping out of place. With this construction the contraction of the mold-board in cooling will have no effect upon the dies E, as the sand in the holes D will yield promptly.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent In chills for casting bolt holes in moldboards, the combination, with the chill D, having sand-holes D, and the die E, having point F, of pattern G, having countersun k holes filled with corresponding cups H, as shown and described.

BURNETT B. HARRIS. Witnesses:

WILLIS A. BUGBEE, GEO. W. MATTHEWS. 

